In a large bowl, take gram flour, fenugreek leaves, red chili powder, turmeric powder, baking soda, sugar, lemon juice, salt, and oil.
Mix the ingredients, add water as required, and make a soft dough. Then grease your hands with oil and make 10-12 oval-shaped muthiya from the dough. Heat the oil and deep fry the muthiya on medium flame.
Fry until golden brown and the outer layer is crispy. With the slotted spoon, transfer them to a plate with a paper napkin. Let it cool.
Now in a bowl, to prepare stuffing masala, take all masala ingredients (coconut, peanut powder, sesame seeds, coriander leaves, green chili, ginger and garlic paste, sugar, lemon juice, and salt).
Mix well and taste it. It must have a strong spicy, mildly sweet, sour, and salty taste. Add ingredients if required.
Take all the chopped vegetables required to make undhiyu. While chopping, makes sure not to separate the segments. And stuff the veggies with prepared masala.
Heat oil over a medium flame in a vessel or a pressure cooker. Add a pinch of hing and saute, then add surti papdi, valor papdi, tuvar lilva, and green peas and add salt. Mix and cook for a while.
Add red chili powder, turmeric powder, cumin powder, coriander powder, and garam masala powder.
Mix well and cook for 5 minutes. Then add potatoes and brinjal, and add a pinch of salt.
Add water and cook until the vegetables are tender. Close the lid and cook for 2-3 whistles.
Add muthiya and cook for another minute or two.
Garnish undhiyu with coriander leaves. Mix and serve the undhiyu with puri.